Grinding-mill.



No. 826,711. PATENTED JULY 24, 1906.

A. P. DAVIS.

GRINDING MILL.

APPLICATION FILEDMAY 16, 1904.

5 BHEETSSHEET 1.

PATENTED JULY 2.4, 1906.

A. F. DAVIS. GRINDING MILL.

APPLIUATION r g i N N FILED MAY 16. 1904.

N a SHEETS-SHEET 2.

No. 826,711. PATENTED JULY 24, 1906. A. F. DAVIS.

GRINDING MILL.

APPL IOATION FILED MAY 18, L904.

6 SHEETS-SHEET 3.

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PATENTED JULY 24; 1906.

A. P. DAVIS.

GRINDING MILL.

APPLICATION FILED MAY 16, 1904.

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w ammzvm PATENTED JULY 24, 1906.

A. F. DAVIS. v GRINDING MILL. APPBI AAAAAAAAAAAAAA 16, 1904.

UNITED srATEs PATENTI orrio I ALBERT -F. DAWIEXND, VERMONT GRINDING-MILL.

Specification of Letters Patent.

Patented July 24, 1906.

Application filed May 16, 1904- Serial No- 203300- To all whom it may concern.-

Be it known that I, ALBERT F. DAVIS, a citi- .zen of the United States,-residing at Rutland,

the center toward the outer edges of the plate is retarded and an opposing surface resented, so that the cooperating plates pro uce a shearing and grinding action to most effectually operate upon the material introduced therein.

A further object of the invention is to provide means by which these lates may be separated when a foreign su stance calcu-' lated to injure the same contacts with the plates and to quickly remove the tension by which the plates are ordinarily held in contact with each other.

Afurther object of the invention is to provide means bywhich the casing inclosing the plates may be readily opened for access thereto when it is desired to renew the grindingplate's carried by the rotatable disks.

Another object of the invention is to provide means at the base of the feed-passage to the plates forcatohing and retaining particles of metal or other substances of greater weight than the material introduced into the mill to prevent the entrance thereof between the grinding-plates.

Another object of the invention is to rovide'a feed-agitator within the hopper o the mill to prevent a clogging of the feed and so constructed as to be capable. of rotation whether the material is being fed to the mill or not.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

In thedrawings, Figure 1 is a side elevation of the mill with parts broken away and the grinding-disks and feed-passages thereto shown in-section Fig. 2, a central horizontal section through the mill; Fig. 3, an end elevation thereof. Figs. 4 and 5 are plans of a preferred construction of cooperating grinding-plates adapted. to be located 0 posite each other; Fig. 6, an edge view of one ofsaid-plates; Fig. 7, a bottom plan thereof. Figs. 8, 9, 10,

and 11 are plans, respectively, of different modifications in the structure of grindingplates, showing variable arrangements of the checks or shouldersupon the radial flanges carried by said plates; Fig. 12, a reduced detail of the detachable lever for opening the mill. Fig. 13 is an elevation of the plates shown in Fig. 4 assembled upon one disk,

and Fig. 14 is a similar view of the plates shown in Fig. 5 upon the cooperating opposite disk.

Like letters of reference refer to like parts in the several figures of the drawings.

The letter A indicates the base of the mill, which may be of any desired construction and is provided with posts or standards A and A at opposite sides of the casing B, provided with bearing-boxes of any suitable construction adapted to receive the driving-shafts A and A for the rotatable disks C and C, reapectively. Each of said shafts .is provi ed with independent driving means-for instance, the band-wheels A secured thereto. The casing B is composed of the upper section B and the lower section B, the latter being secured to the base A and the former pivoted thereto at B The disk C is provided with a'central feed-opening C surrounding the hub C of the disk, and the casing at this point is provided with a feed-ring B, remov ably secured to the casing and communicating with the feed-spout B 'This ring is provided with a central ridged portion B to form a recess upon the outer side there'- of, within which nails or other substances of greater gravity than the material .to be ground will be caught and retained and from which they may be removed .by means of the door-plate B, as shown in Fig. 1 The opposite disk C is provided with a hub C, secured to the shaft A and the casingsB" and B are each provided with a segmental plate B", removably secured thereto and carrying a stuffing-box ring B, as usual in this art. Communicating withv the feed-spout B is a feed-passage D, having a latch or feed plate D extending diagonally across the same and adjustably-secured by means of a screw D mounted upon the outer wall of the feedhop per D", said latch passing through a suitable.

I opening D in the side wall of the passage D.

Above the latchD a rotatable ejector D is provided and com rises radial arms adapted to pass throu h t e body of material contained in the t oat of the hopper to prevent packing of the same and to insure a constantfeed thereof. This ejector may be driven in any desired manner-for instance, by the shaft D, provided with a ulley D upon its outer end, geared to a suita le driving-pulley upon the shaft A.

Each of the disks C and C is provided with the cooperating grinding-plates E,- secured in position in any desired manner-for instance, by means of boltsE' passing through the plates and disks and secured by nuts E A preferred construction of these plates is shown in Figs. 4, 5, 6, and 7, wherein it will .14, the flanges E upon one of said disks being dis osed at a greater distance apart than upon t e other, so that when assembled the inner flange of each disk will not be in alinement, but will cooperate with the radiallydisposed wed e-shaped ribs E, E, and E,

I carried by eac i of the plates; The radial ribs E extend equal distances apart between the circular flanges E while the ribs E extend inward toward the axis of rotation from the inner circular flange. The ribs E are of less length than the ribs E and disposedintermediate thereof to cooperate with the inner flange E of the associated plate. Each of these radially-disposed ribs is provided upon one or more of its faces or sides with a check or.shoulder E, which tends to check the flow of the grain toward the periphery of the plate and to produce a shearing cut in connection with the inner flange of the cooperating plate, while the opposite plates are provided with a different number of radial ribsfor instance, as shown in Figs. 4 and 5, wherein a larger number of ribs is provided upon the plate shown in Fig. 4, so as to provide a greater grinding-surface at the peri hery of the plates and to prevent any two ri s meeting in the same position, thus insuring a greater capacity to the mill and a reduction in the power required in the operation there of. The character and position of the check.

or shoulder E provided upon each of the ribs may be varied as found desirable. For instance, in Figs. 4 and 5 the check is cut into the rib. The under surface of each of these plates is provided with a series of balancingnges E, disposed in a recess E as shown i Fig. 7, which may be ground out or removed for the purpose of facilitating the balancing of the plate in assembling a series thereof upon the e-riphery of the disk, as it is essential that t e disk should be properly balanced in order to secure an even motion in the grinding action.

In Fig. 8 a modified construction of plate is shown in which the checks or shou ders F may be provided upon the-ribs E in connection with the checks E cut into the ribs E and E, as before described.

In Fig. 9 a further modification of the checks upon the plate is shown, wherein the checks or shoulders F project outwardly from all of the ribs'E E, and E.

In Figs. -10 and 11 a further modification of two cooperating plates is shown, in which the plate E is provided with the concentric segmental flanges E those upon each plate bein at a different distance apart, while the ribs E upon one plate are provided with checks or shoulders F upon one side thereof and the ribs E with a similar shoulder F uponthe op osite side, while the extended radial ribs E are provided at a point coincident to the inner flange E upon the opposing plate with oppositely-disposed shoulders or checks F which act as a shearing out upon the inner flange E of the opposite plate, the position of said flanges being indicated by dotted lines in Figs. 10 and 11. The ribs E are also provided with the retarding shoulders F upon opposite sides thereof, as described in connection with the other forms of the invention. The co6perating plate to that just described has the oppositely disposed shoulders F located upontheribs E to'act in a similar manner in connection with the inner flange E of the first-mentioned plate. In other words, the arrangement of shoulders disposed upon the ribs E in one plate are duplicated upon the ribs E of the opposing plate, thus producing a structure in which no two ribs will meet in the'saine relative position and securing an even distribution of the grinding action and consequent wear over the entire surface of the plate as it performs a continual shearing cut, thus increasing the capacity of the mill and requiring less power than otherwise. All of the plates hereinbefore described are adapted to be used upon either of the disks in order that the direction of rotation of the disks may be reversed and the wear taken upon an opposite side of the ribs from that first used.

For the purpose of permitting a movement of one of the disks with' its grinding-plate away from the other in the event of a foreign substance being introduced with the grinding material the shaft of the disk C is shown as "provided with a fixed grooved collar G thereon beyond the fixed driving-pulley A and carrying the movable flanged plate G, through which the release-rods G extend and are adjustably secured, by means of nuts G, at opposite sides of the plate. These rods pass through suitable guide-eyes G, carried by one of the standards A, and at their outer end are passed through a plate G and secured thereto by nuts G",similar to the nuts G The tension-headH comprises a casin supported rigidly from the plate I", secure to or .formed with the bearing I", carried by the bearing-standard by means of cap-screws I and is provided with a thrust-block H, adjustably held under tension by a spring H encircling the body of the block and bearing at one end against a flange H thereon and at its op osite end against a ring H adapted to be a justed by the threaded sleeve H, mounted in the casing, to bear upon the ring and adjust the tension of said spring. 'This block H is interiorly threaded to receive a release-screw H of coarse pitch, which screw is also interiorly threaded to receive a regulator-screw I of considerably finer pitch and carrying a thrust pin or bearing I for the shaft A The release-screw H is provided with a quick-release wheel H keyed thereon, and passes through the plate G soas to rotate therein, while the coarse threads form a collar of sufficient diameter to engage the inner face of said plate in the rotation of the screw, and thus carr the plate longitudinally in-the travel of t e screw as unthreaded from the block, thereby transmitting a longitudinal movement to the collar G upon the shaft. carried thereby being mounted in the release-screw H move simultaneously therewith, thus shifting the bearin I to permit the longitudinal movement of t e shaft, while the flange H remains in contact with the plate I and resists the thrust due to the operation of the release-screw. The tension of this spring H is adapted to be adjusted to any desired degree by means of the threaded sleeve H bearing upon the ring H, which contacts with one end .of the s"ring. The structure so far described permits the shaft to move longitudinally, carrying the headblock H therewith and placing the spri'n under tension, which restores the 'n gplate to its original position. It is, owever,

desirable to quickly release without affecting the tensionof this spring, which is accomplished by rotation of the, release-wheel H and the screw H, carried thereby, which, owing to the pitch of its thread, quicklfy; withdraws the latesGr and G. and the sha as the screw unthreads from the head H, and its threads contact with the late G and carry it longitudinally therewit in which condition it maybe he (1 by means of a springcatch H having-a handle H in convenient position, and a tooth H adapted to engage teeth or notches H, carried upon the hub of the release-wheel H The normal position of the grinding-plates relative to each other may be adjusted by means of the regulator-screw I, carrying at The regulator-screw I and bearing its inner end an end hearing I for theshaft A and threaded throughthe release-screw H so that when rotated by means of the handwheel I the bearing I and screw I will be jointly adjusted toward and from the end of the shaft. This regulator-screw may be held in its adjusted position by means of a set-nut I provided with an operating-handle I", and the inner end of the screw is adapted to bear against a step 1 of suitable bearing material, which is provided with an interior aperture I for the purpose of feeding a lubricant to the bearing-face thereof, which aperture communicates with a feed-opening I, extending laterally through the shaft and communicating with the oil-box of the bearing I carried by the standard.

When it is desired to open the mill for the purpose of repair or changing the grinding plates therein, one of the disks may be swung outward, as shown in Fig. 3, by means of the standards A which carry the adjustable shaft A said standards being pivotally mounted upon the base A by means of pivoting-ears Jon the base'of one side of the standards and similar ears J, carried by the base of the mill, through which a pivot or rod J extends. These standards are securely held upon the base of the mill in the ordinary operation thereof b means of the set-screws J threadedin fixe lugs J on the base of the mill and bearing against the opposite sides of the standards to prevent any movement thereof under ordinary grinding conditions. For the purpose of swinging the pivoted members of the mill into the position shown in Fig. 3 a lifting-lever K has been provided,

the end of which is adapted to extend throu h or beneath the lugs carried at one side 0% the standards, 'Whlle for the purpose of supporting the lever in an elevated position a leg or foot K is ivotally mounted thereon at K and provi ed with a reduced point K adapted to seat in a suitable recess or socket J'in the base A of the mill. It will be seen that 'the parts maybe elevated and sup orted in any desired manner, and the lever is herein shown only as one convenient means of effecting the same. In swinging one of the disks outward, as shown in Fig. 3,

,it is desirable to provide a removable door or closure-plate J at the side of the lower portion of the casing toward which the disk is swung, as shown in Fig. 2, in order that the disk may pass beyond the edge of the lower case.

In the operation of the invention the opposite disks carrying the grinding-plates are rotated in opposite directions in the usual manner, one of said disks being provided with the feed-opening therethroughfor the purpose of introducing the material to be ground between the disks and into contact with the opposite grinding-plates, while the other disk is mounted for a movement longitudinally with its shaft in the event of foreign substances becoming introduced between the plates, while it is normally held in proper position by means of the tension-spring. When it is desired to quickly release or separate the upon the end-bearing head and transmits motion through the plates and release-rods. Thev adjustment of this end bearing is effected by the adjustment of the threaded screw, which is threaded through the releasescrew, as before described. This releasescrew permits the disks to be quickly drawn apart and held in this position until restored, when the tension-spring is permitted to again act thereon, thus reventing injury to the plates. It will also be observed that the means provided for o ening the mill permit ready access to the isk for the purpose of removing or repairing the plates thereon or for reversing them in position, which can be accomplished by disposing them upon an opposite disk to secure the use of both edges of the flanges and ribs upon the disks. The feed-agitator disposed in the feed-passage to the mill is so arranged as to be capable of operation whether the feeding-latch be open or closed, as in its 0 eration it does not aflect the feed of materlal to the mill, but merely revents the clogging or massing of the same in the throat above the latch.

It will be obvious that changes may be 'made in the details of construction and configuration such as are within the skill of a mechanic familiar with this art without departin from the spirit of the invention as defined by the appended claims.

The millstone dress disclosed in this ap lication is not claimed herein, being claimed in my divisional application of this case filed November 29, 1905, Serial No. 289,636.

Having described 'my invention and set forth its merits, what I claim, and desire to secure by Letteiis Patent, is I 1. In a grinding-mill, a disk composed of a series of segmental plates provided with a series of grinding-ribs upon one face and a series of parallel balancing-ribs upon the 0 p0- site face of the plates extending perpen icularly to a radius of said plates.

2. A grinding-plate provided with a series of grinding-ribs upon one face and a series of 'arallel balancing-ribs upon the opposite fhce of the plate extending perpendicularly to a radius of said plate.

3. In a grinding-mill, a longitudinallymovable shaft supporting a grinding-disk, means for maintaining the shaft under ten sion, a tension-head, an end bearing for said movable shaft, a release-screw supported by said tension-head and carrying the end bearing, a plate mounted on said screw to travel longitudinally therewith, and connections from said plate to the movable shaft to positively shift the latter. I

4. In a grinding-mill, a longitudinallymovable driving-shaft supporting a grindingdisk, means for maintaining the shaft under tension, a tension-head, a release-screw supported by said tension-head, a plate upon said screw to travel longitudinally therewith, means for rotating said screw, a collar secured to said shaft, a plate loosely mounted upon said collar and rods extending between the screw-plate and collar-plate to shift said shaft.

5. In a grinding-mill, a disk provided with grinding-plates, a shaft for rotatably supporting the same, an opposite disk, a longitudinally-movable shaft supporting the same, means for maintaining the movable disk and shaft under tension, an end bearing for said movable shaft, a tension-head within which said bearing is mounted, a release-screw supported by said tension-head, means for rotatmg said screw, a latch for retaining said means in position, a threaded shaft for adjustin said end bearing, means for rotating said s aft, means for holding said shaft in adjusted position, a thrust-block within said head, a tension-spring disposed within the head and bearing upon a flange carried by said thrust-block, an adjusting-screw engaging said head to adjust the tension of said spring, a driving-pulley secured to said movable shaft, a sleeve secured upon said shaft and provided with a loosely-mounted flange thereon, a flange movable longitudinally with the release-screw, and rods extending between said flange carried by the releasescrew and the flange u on the shaft-sleeve.

6. In a grinding-mil a disk provided with grindinglates, a shaft for rotatably supportin t e same, an opposite disk, a longitudina ly-movable shaft supporting the same, means for maintaining the movable disk and shaft under tension, an end bearing for said movable shaft, a tension-head within which said bearing is mounted, a release-screw supported by said tension-head, means for rotating said screw, alatch for retaining said means in position, a threaded shaft for adjusting said end bearing, means for rotating said shaft, means for holding said shaft in adjusted position, a thrust-block within said head, a tension-spring disposed within the head and bearing upon a flange carried by said thrust-block,an adjusting-screw engaging said'head to adjust the tension of said spring, a driving-pulley secured to said movable shaft, a sleeve secured upon said shaft and provided with a loosely-mounted flange thereon, a flange movable longitudinallv with disks, a longitudinally-movable sha of said disks, a sliding recessed thrust-block the release-screw, rods extending between said flange carried b the release-screw and flange u on the sha t-sleeve, a bearing-step provide with a lubricating-passage therein and adapted to contact with said end bearing, and means for feeding a lubricant to said step.

7. In a grinding-mill, cooperatinggrindingdisks, a longitudinally-movable shaft for one of said disks, a sliding recessed thrust-block at the outer end of said shaft, anadjustable end bearing for said shaft carried within said block, a head-casing surrounding said block, a flange provided at one end of said block, a tension-spring disposed within the casing and bearing upon said flange, a releasing-screw threaded into said block and carrying said end. bearing, a hand-wheelsecured to said screw for rotating the same, and means for transmitting motion to "said shaft from the releasing-screw.

8. Ina grinding-milhcoiiperating indingi for one at the outer end of said shaft, an adjustable end bearing for said shaft carried within said block, a head-casing surrounding said block,

a flange provided at one end of said block, a

tension-spring disposed within the casing and bearing upon sai block-flange, a releasing screw threaded. into said block and carrying saidend bearing, a handwheel securedto said screw for rotating the same, means for transmitting motion to said movable shaft from the releasing-screw, a series of securingteeth carried by the hub of said wheel, and a spring-latch secured to said casing to engage said teeth.

9. .In agrindin mill, cooperating grindingdisks, a longitudihally-movable shaft for one of said disks, a sliding recessed thrust-block at the outer end of said shaft, an end bearing for said shaft carried within said block,'aheadcasing surrounding said block, a flange pro-.

vided at one end of said block, .a tensionspring disposed within the casing and bearing upon said flange, a releasing-screw threaded into said block, a hand-wheel secured to said screw for rotating the same, means for trans-. mitting motion to said shaft from the releasing-screw, a series of. securing-teeth carried by the hub of said wheel, aspring-latch secured to said casing to engage said teeth, a

threaded shaft extending from the end bearing through said release-screw, a hand-wheel upon the end of said threaded shaft, and a lock-nut disposed upon said threaded shaft to engage the hand-wheel of the release-screw.

10. In a grinding-mill, arotatable disk having grinding-plates, a shaft therefor mounted in a bearing carried by a fixed standard, -a cooperatin disk having a driving-shaft, a standard or said driving-shaft pivotally mounted at one side of the mill to shift one.

disk in a parallel vertical lane to the other, and means carried by the base of the mill for engaging and retaining the pivoted stand- 4 in its normal position.

1 1. In a grinding-mill, a rotatable disk having grinding-plates, a shaft therefor mounted in a bearing carried by a fixed standard, a cooperatin disk having a driving-shaft, a standard or said driving-shaft pivotally mounted at one side of the mill to shift one' disk in a arallel vertical plane to the other, a casing or said disk having the upper portion thereof removable, and horizontally-disposed set-screws carried by lugs upon the ase of the mill to engage the opposite sides of said standard when in a horizontal plane.

12. Ina grinding-mill, a rotatable disk having grinding-plates, a shaft therefor mounted in a bearing carried by a fixed standard, a

. cooperatin plate-disk having a driving-shaft,

a standar for said driving-shaft pivotally mounted at one side of the mill, a casing for said disk having theupper portion thereof removable, set-screws carried by lugs upon the base of the mill to en a sides of said standards, and a removable section in the lower portion of said mill at the pivotal side of the standard.

13. In a grinding-mill, a rotatable-disk having grinding-plates, a shaft therefor mounted ina bearing carried by a fixed standard, a cooperatin plate-disk having a driving-shaft, a standar for said driving-shaft pivotally mounted at one side of the mill, a casing for said disk having the upper portion thereof pivoted at the opposite side from said pivoted' standard, set-screws carried-by the lugs upon the base of the mill to engage the opposite sides of said'standards, a removable section in the lower ortion of said mill at the pivotal side thereo ,lifting-lugs extendin lat-- erally fromsaid standards, and 'a lever a apted to engage beneath said lugs.

14. In a grinding-mill, a rotatable diskhaving grinding-plates, a shaft therefor mounted in a bearing carried by a fixed 'standard,*a

cooperatin plate having a driving-shaft, a

standard or said driving shaft pivotallymounted at one side of the mill, a casing for said disk having the upper portion thereof rege the opposite the movable, set-screws carried by lugs upon the b so of the mill to "engage the opposite sides of said standards, a removable section in the lower portion of said mill at the pivotal side thereof, liftin lugs extending laterally from said standarfs, and a lever adapted to engage beneath said lugs.

15. In a grinding-mill, a grinding-disk, a shaft therefor, a pivotally-mounted standard forsai'd shaft, lifting-lugs carried by said standards, and a lifting-lever" to engage said lugs provided with a pivoted foot to engage the base of the mill.

16. In a grinding-mill, rotatable disks having driving-shafts, a casing surrounding said disks and having the upper portion thereof above the hub of the disks pivoted at one side thereof, a pivoted bearing-standard for one of said shafts, and a removable section to the lower portion of said casing at the same side thereof as the pivot of the standard.

17. In a grinding-mill, an apertured grinding-disk, a casing therefor, a feed-passage having a feed-ring leading to said disk and provided at its lower portion with a retaining-pocket below said ring, and means for removing material from said pocket.

18. In a grinding-mill, cooperating grinding-disks one of which is provided with a feed-opening adjacent to its hub, a casing having a feed-passage, and a removable feed ring adapted to discharge into the opening in said disk and ridged upon its inner face to form a retaining-pocket in the feed-passage.

19. In a grinding-mill, cooperating grinding-disks one of which is provided with a feed-opening adjacent to its hub, a casing, and -a removable feed-ring ada ted to discharge into the opening in said isk and provided at its lower portion with a retainingpocket.

20. In a grinding-mill, cooperating grinding-disks one of which is provided with a feed-opening adjacent to its hub, a casing, a removable feed-ring ada ted to discharge into the opening in said isk and provided at its lower portion with a retaining-pocket, and a door at the lower portion of said pocket for discharging the contents thereof.

21. In a grinding-mill, cooperating grinding-disks, a casin therefor, a feed-passage leading to said dlsks, a rotatable agitator disposed to rotate in a vertical lane parallel and adjacent to one Wall of sai passage, and an adjustable latch-plate disposed diagonally to the vertical axis of said passage with its free end directly beneath said agitator.

In testimony whereof I afiix my signature in presence of two witnesses.

ALBERT F. DAVIS.

Witnesses:

M. C. WEBBER, P. L. WEBBER. 

